Hello guys, a friend of mine has been having issues with her dog. She has an electric fence around the coop, and its throughly predator proofed, but the hens know the grass is greener on the other side. Their boy has gotten 2 chickens in the last 2 weeks. Just opening the door they can run out, and boom, they don't know what hit them.
If the chickens are coming out the door when she opens it, maybe make a small pen outside the door, with a door on that small pen too. Then she can go into the small pen, close that door, and go into the main chicken pen. When coming out, make sure all chickens are back in the main pen and the door is closed BEFORE opening the small pen to go out.
Like an airlock, or a mud room, or an arctic entry, or any of the other situations where you really need to keep something out or in.
The few extra feet of fence plus an extra door, and probably two more fence posts, may not be any more expensive or more effort than locating, buying, and perhaps raising a special kind of chicken--and will probably work better, too. The small pen would not even need to be fully predator proof, because chickens would not be in it for any length of time.